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Directional solidification heat corrosion resistant nickel base cast superalloy and preparation method thereof

A technology of directional solidification and superalloy, which is applied in the improvement field of casting superalloy, can solve the problems of high cost of alloy and cannot be applied to gas turbine turbine blades, etc., and achieves the effects of good parallelism, stable structure and excellent comprehensive performance.

Inactive Publication Date: 2008-10-29
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The disadvantages of the above alloys are: from the perspective of mechanical properties, the alloy cannot be used for gas turbine blades with an operating temperature higher than 900°C, and the cost of the alloy is relatively high

Method used

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  • Directional solidification heat corrosion resistant nickel base cast superalloy and preparation method thereof
  • Directional solidification heat corrosion resistant nickel base cast superalloy and preparation method thereof
  • Directional solidification heat corrosion resistant nickel base cast superalloy and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0028] By weight percentage, the alloy composition is: C 0.07%; Cr 14.8; Co 9.5%; W 5.1%; Mo 1.8%; Al 3.1%; Ti 4.6%; Hf 0.46%; Ta 0.8%; B 0.08%; Y( Addition amount) 0.015%; Mn 0.18%; Si 0.18%; P 0.006%; S 0.007%; Fe 0.3%;

[0029] Alloy melting and casting: use a 25kg vacuum induction furnace to melt the master alloy, and use the liquid metal cooling (LMC) process for directional solidification, and the vacuum degree of the directional furnace is ≤5×10 -4 mmHg, pouring temperature 1540°C, drawing speed 10mm / min, temperature gradient 100°C / cm, liquid tin temperature 270°C.

[0030] Alloy heat treatment system: 1170°C, heat preservation 4h, air cooling +1050°C, heat preservation 4h, air cooling +850°C, heat preservation 16h, air cooling.

[0031] The main mechanical properties of the alloy:

[0032] Tensile properties at room temperature: σ b 1320MPa; σ 0.2 990MPa; δ8%; 4.0%.

[0033] Durability: 930℃, stress 270MPa, duration τ150.5h, δ20.8%.

[0034] The transverse and...

Embodiment 2

[0036] By weight percentage, the alloy composition is: C 0.045%; Cr 14.7; Co 9.2%; W 4.85%; Mo 1.72%; Al 2.85%; Hf 0.35%; Ti 4.35%; Ta 0.4%; B 0.07%; Y( Addition amount) 0.015%; Mn 0.12%; Si 0.10%; P 0.006%; S 0.005%; Fe 0.2%;

[0037] Alloy smelting and casting, using a 25kg vacuum induction furnace to melt the master alloy, and using the liquid metal cooling (LMC) process for directional solidification, the vacuum degree of the directional furnace is ≤5×10 -4 mmHg, pouring temperature 1520°C, drawing speed 8mm / min, temperature gradient 95°C / cm, liquid tin temperature 300°C.

[0038] The heat treatment system is: 1200°C, heat preservation 2h, air cooling +1090°C, heat preservation 2h, air cooling +850°C, heat preservation 24h, air cooling.

[0039] The main mechanical properties of the alloy:

[0040] Tensile properties at room temperature: σ b 1330MPa; σ 0.2 1040MPa; δ8.0%; 9.5%.

[0041] Durability performance: 930℃, stress 270MPa, τ117.3h.

Embodiment 3

[0043]In terms of weight percentage, the alloy composition is: C 0.08%; Cr 15.3%; Co 9.9%; W 5.7%; Mo2.2%; Al 3.2%; Ti 4.9%; Hf 0.55%; Ta 1.3%; B 0.09%; Y (addition amount) 0.015%; Mn 0.19%; Si 0.18%; P 0.007%; S 0.008%; Fe 0.4%;

[0044] Alloy melting and casting: use a 25kg vacuum induction furnace to melt the master alloy, and use the liquid metal cooling (LMC) process for directional solidification, and the vacuum degree of the directional furnace is ≤5×10 -4 mmHg, pouring temperature 1500°C, drawing speed 12mm / min, temperature gradient 110°C / cm, liquid tin temperature 270°C.

[0045] Alloy heat treatment system: 1170°C, heat preservation 4h, air cooling +1050°C, heat preservation 4h, air cooling +850°C, heat preservation 16h, air cooling.

[0046] Tensile properties at room temperature: σ b 1340MPa; σ 0.2 1110MPa; δ5.5%; 7.5%.

[0047] Durability performance: 930℃, stress 270MPa, τ124.8h.

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Abstract

The invention relates to a directional-freezing heat-proof corrosion-resistant nickel base cast superalloy with low cost and excellent performance. The cast superalloy has the chemical composition range by weight percentage as follows: C is 0.04 to 0.09; Cr is 14.5 to 15.3; Co is 9.0 to 9.9; W is 4.7 to 5.9; Mo is 1.6 to 2.3; Al is 2.8 to 3.3; Ti is 4.2 to 5.0; Hf is 0.3 to 0.6; Ta is 0.3 to 1.5; B is 0.06 to 0.10; Y (adding quantity) is 0.015; Mn is less than or equals to 0.2; Si is less than or equals to 0.2; P is less than or equals to 0.008; S is less than or equals to 0.008; Fe is less than or equals to 0.5; the other weight percentage is composed of Ni. A vacuum induction furnace is adopted to smelt master alloy, and the directional-freezing is performed in a liquid-metal-cooled (LMC) furnace to prepare columnar grain alloy; the vacuum degree of a directional furnace is less than or equals to 5*10<-4>mmHg, the casting temperature ranges from 1480 to 1570 DEG C, the drawing velocity is 3 to 15mm / min, the temperature gradient is 95 to 145 DEG C / cm, and the temperature of melting tin ranges from 250 to 350 DEG C. The invention provides the heat-proof corrosion-resistant superalloy, which contains Ta, does not contain alloying elements that are Re (with low cost), Nb, Zr and Ce, and has a stable microstructure. Compared with cheC88 Y-BN, the tensile-strength (using Delta (b) and Delta0.2 to represent) is increased more than 30 percent, the plasticity is improved obviously, the lasting temperature is risen by 30 DEG C under the same stress condition, and the cast superalloy is applied to manufacture turbine blades of a combustion turbine which is used under 930 DEG C.

Description

Technical field: [0001] The invention relates to an improved technology for casting high-temperature alloys, in particular to a low-cost directional solidification and heat-corrosion-resistant nickel-based casting high-temperature alloy and a preparation method thereof. Background technique: [0002] Document Паспорт ПоОплав ЧС88У-Ви (instructions for alloy ЧС88У-Ви) pointed out that the chemical composition stipulated in the alloy technical conditions (ТУ14-1-4828-90) is: C 0.04-0.09%; Cr15.4-16.3%; Co 10.0 -11.5%; Mo 1.6-2.3%; W 4.7-5.9%; Al 2.8-3.3%; Ti 4.2-5.0%; Nb 0.1-0.3%; Hf 0.2-0.4%; B 0.06-0.10%; ) 0.03%; Y (addition) 0.03%; Ce (addition) 0.015%; Si≤0.3%; Mn≤0.3%; S≤0.008%; P≤0.008%; Fe≤0.5%; [0003] The alloy adopts ordinary precision casting process to prepare gas turbine turbine blades, and its structure is equiaxed crystal, which is used to manufacture turbine moving blades whose working temperature is not higher than 900°C. [0004] The heat treatment proces...

Claims

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Application Information

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IPC IPC(8): C22C19/05C22C1/02B22D27/00C22F1/10
CPCC22C19/056
Inventor 郭建亭周兰章侯介山袁超赖万慧秦学智
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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